Utami, N. W., S. A. Sayuti, and Jailani. “Math and Mate in Javanese Primbon: Ethnomathematics Study”. Journal on Mathematics Education, vol. 10, no. 3, Sept. 2019, pp. 341-56, https://jme.ejournal.unsri.ac.id/index.php/jme/article/view/3798.